N-14 NQR RELAXATION STUDY IN NA1-XAGXNO2 MIXED-CRYSTALS

N-14 nuclear quadrupole resonance (NQR) relaxations in mixed crystals Na1-xAgxNO2 (0 less than or equal to x less than or equal to 0.16) hav e been investigated at room temperature. The spin-spin relaxation time (T-2) increases rapidly with the increasing Ag+-concentration up to x similar to 0.01. Above this concentration, it remains essentially con stant, indicating a typical rigid lattice behavior similar to a previo us study. On the other hand, the spin-lattice relaxation time (T-I) de creases with the increasing Ag-concentration. This trend appears to be related with the change of the cooperated flipping motion of the NO(2 )(-)ion group. (C) 1998 Elsevier Science Ltd.